05 July 2016 by
Peter Seenan

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As with
animation frame callbacks
(commonly referred to as “requestAnimationFrame”)
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, the programming interface component of this specification allows animations to be created from script. The animations created using the interface defined in this specification, however, once created, are executed entirely by the user agent meaning they share the same performance characteristics as animations defined by markup. Using this interface it is possible to create animations from script in a simpler and more performant manner.

The time values used within the programming interface correspond with those used in
animation frame callbacks
[HTML]
and their execution order is defined such that the two interfaces can be used simultaneously without conflict.

The programming interface component of this specification makes some additions to interfaces defined in HTML
[HTML]
.

This specification begins by defining an abstract model for animation. This is followed by a programming interface defined in terms of the abstract model. The programming interface is defined in terms of the abstract model and is only relevant to user agents that provide scripting support.

Where this specification does not specifically link to a procedure, text that requires the user agent to update a property such as, “make
animation
’s
start time
unresolved
”, should be understood to refer to updating the property directly
without
invoking any related procedure.

At a glance, the Web Animations model consists of two largely independent pieces, a and an . The role of these pieces is as follows:

Graphically, this flow can be represented as follows:

For example, consider an animation that:

The first three points apply to the timing model. At a time of 6 seconds, it will calculate that the animation should be half-way through its second iteration and produces the result 0.5. The animation model then uses that information to calculate a width.

This specification begins with the timing model and then proceeds to the animation model.

Takes a moment in time and converts it to a proportional distance within a single iteration of an animation called the . The is also recorded since some animations vary each time they repeat.